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Marrakai - I am with you on case length. When my bro and I re-=barreled our black powder ctg. guns, his a Sharps and mine a Rolling Block, we went with the .50 Alaskan case. This, of course, is a blown out .348 Winchester at 2.1" long and easily runs over 2,000fps with low pressure smokeless loads and 450gr. bullets. The 520 and 550gr. both make 1,800fps, safe in both guns using easily aquired H4895 and Varget. With black powder loads to 85gr., they are very accurate and about duplicate the .50/90, while accuracy is very much better than any original Sharps ever gave in that chambering. We went with 24" twist McGowen barrels and mine,w iht BP lads runs 1-1/2" at both 100 and 200 meters using tang rear and hooded post front sights.
; We both struggled with getting descent accuracy from the long cases, 3-1/4" in both the .45 and .50 cal. That was enough and went with the easily aquired .348 brass in it's shorter length. Accuracy was an instant deal with them as most any load shot better than the best of the longer cases.
; AA and Hodgdon both have data for the big cases.

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Oh how i long for a 577x 2.75" now.........:(

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